Simultaneous posthydrolysis and liquid–liquid extraction: a SIMPLLE process to detoxify eucalyptus prehydrolysis liquor

Abstract The prehydrolysis liquor from the Kraft process is rich in sugars and could thus serve as a sustainable feedstock for production of various chemicals. However, its industrial utilization impeded by presence fermentation inhibitors extensive lignin precipitation, latter receiving only little attention literature. In order to provide suitable biotechnological or chemical conversion, eucalyptus wood must be detoxified whilst preventing precipitation lignin. To increase yield monomeric sugars, acid posthydrolysis should investigated. Various solvents solvent mixtures were screened high temperature liquid–liquid extraction isothermally separated liquor. Their capability prevent extract was assessed using mass balances size-exclusion chromatography. Based on screening, simultaneous proposed investigated statistic experimental design. Liquid–liquid aliphatic alcohols effectively prevents addition 25% (w/w) tri- n -octylamine found overall inhibitor efficiency. conditions Box-Behnken design, allowing maximum sugar 83.0% at purity 91.6%. liquid-liquid (SIMPLLE) avoids industrial-level problems associated with precipitation. It provides carbohydrate-rich stream low levels inhibitors, enabling further conversion value added products.